... path plotting (微波)路径测绘 path predicate路径断定 path problem 路程问题 ...
双语例句
1
Each step in a path expression can also contain a predicate that filters the elements that are returned by that step, retaining only elements that satisfy some condition.
路径表达式中的每一步还可以包含一个谓词，用于过滤该步返回的元素，只保留满足某种条件的元素。
2
Before access path selection, the DB2 optimizer transforms SQL statements into forms that are semantically identical, such as by using predicate pushdown or predicate transitive closure.
Missing statistics can cause the optimizer to overestimate or to underestimate the selectivity of a predicate, and eventually to select an inefficient access path.